Internal Server Error

[aaeb3517ddfe720c4c201940] /api.php?action=feedcontributions&user=Grudy&feedformat=atom Error from line 22 of /var/www/html/wiki/extensions/ConfirmEdit/includes/ConfirmEditHooks.php: Class 'ReCaptcha' not found
Backtrace:
#0 /var/www/html/wiki/extensions/ConfirmEdit/includes/ConfirmEditHooks.php(118): ConfirmEditHooks::getInstance()
#1 /var/www/html/wiki/includes/Hooks.php(174): ConfirmEditHooks::onAPIGetAllowedParams()
#2 /var/www/html/wiki/includes/Hooks.php(202): Hooks::callHook()
#3 /var/www/html/wiki/includes/api/ApiBase.php(2367): Hooks::run()
#4 /var/www/html/wiki/includes/api/ApiBase.php(774): ApiBase->getFinalParams()
#5 /var/www/html/wiki/includes/api/ApiBase.php(878): ApiBase->extractRequestParams()
#6 /var/www/html/wiki/includes/api/ApiMain.php(683): ApiBase->getParameter()
#7 /var/www/html/wiki/includes/api/ApiMain.php(518): ApiMain->handleCORS()
#8 /var/www/html/wiki/includes/api/ApiMain.php(508): ApiMain->executeActionWithErrorHandling()
#9 /var/www/html/wiki/api.php(87): ApiMain->execute()
#10 {main}